Helmet



FIG. 1 is a front view of a helmet in a narrow configuration;

FIG. 2 is a first side view thereof in a narrow configuration;

FIG. 3 is a rear view thereof in a wide configuration;

FIG. 4 is a rear view thereof in a narrow configuration;

FIG. 5 is a second side view thereof in a narrow configuration;

FIG. 6 is a top view thereof in a narrow configuration with open vents;

FIG. 7 is a top view thereof in a narrow configuration with closed vents;

FIG. 8 is a bottom view thereof in a wide configuration;

FIG. 9 is a perspective view showing the front and side thereof in a narrow configuration; and,

FIG. 10 is a perspective view showing the rear and side thereof in a narrow configuration.

The broken lines are included for the purpose of illustrating portions of the helmet that form no part of the claimed design. 

CLAIM We claim the ornamental design for a helmet, as shown and described. 